Lead-base alloy



UNITED sm es PATENT OFFICE.

ELIODOIRI) DE CAMPI, OF CHICAGO, ILLINOIS, ASSIGNOR T UNITED LEAD COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

LEAD-BASE ALLOY.

No Drawing.

To all whom it may concern:

Be it known that I, ELIoDoRo on Caner, United States citizen, residing in Chicago, Illinois, have invented the following-described Improvements in Lead-Base Alloys.

My invention relates to hard lead alloys for machinery bearings and like uses and particularly to those composed of lead hardened by the addition of one or more of the alkaline earth metals or according to the formulas set forth in Frary and Temple Patents Nos. 1,158,671, 1,158,672, 1 158573, 1.1584574, 1,158,675.

The purpose is to improve the fluidity of such alloys when molten and particularly to restrain their tendency to dross so that they may be repeatedly melted without unusual impairment. The invention consists in the new composition herein disclosed and in the method of compounding lead base alloys to produce the results stated.

I proceed as follows:

lnto a quantity of molten lead alloyed with one or more of the metals of the group mentioned I introduce a mixture composed of aluminum and some metal capable of readily and directly alloying both with the aluminum and with the lead. Suitable metals for this purpose are nine, tin and n'iagnesium, and any one or more of these metals may be used. Their function is'to carry the aluminum into admixture or chemical union with the lead wherein its preseme. even in extremely small amounts, materially restrains the drossing tendency. l have discovered that an amount low as .02)? of the whole alloy-is amply sullicient for every practical purpose with alloys of the class mentioned and the amount of the metal or metals used'as the carrier need not exceed .957 of the whole alloy. The drossiug tendency is thus restrained without materially changing the proportions of the principal ingredients. By preference ll. compmind the said mixture so that in the product alloy the relative proportions are about as follows:

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Specification of Letters Patent.

Patented Nov. 30, 1920.

Application filed July 30, 1919. Serial No. 314,386.

teristics of the respective metals to the product. When magnesium is used as the carrier metal it exerts a hardening effect on the lead supplemental to that of the other hardening ingredients present and for this reason it is sometimes preferred in place of either the zinc or tin or both. The lead should preferably be present in an amount in excess of 90% in any event. An example of the lead base bearing metal of the kind herein referred to and with which I now prefer to use my invention is constituted as follows when containing alumimim ac cording to the present disclosure.

About- Itllllllll 1. (.alclum hlercury i; 25% 'l n 25% A1110 .1091; Aluminum 02 Lead 97. 83%

The invention however is not to be understood as llmited to this particular formula as many other alloys consisting mainly of lead may be similarly treated with equal or similar results.

tlaims:

1. The method of improving alloys mainly composed of lead, which consists in mixing aluminum with a metal or metals capable of alloying therewith and with lead and in troducing the mixture into said alloy.

2. A hard lead alloy suitable for bearings and like uses comprising a main body of lezuh a lead-hardening metal, aluminum and a small amount of metal capable of directly alloying with both aluminum and lead.

3. A bearing-metal alloy containing a main body of lead hardened by the presence of barium and calcium and containing a fraotion of a. percentuin of aluminum.

4. A bearing-metal alloy containing a main body of lead hardened by the presence of barium and containing a fraction of a. percentum of aluminum.

5. A bearing-metal alloy containing a main body of lead hardenedby the presence of calcium and cout-ainii'lg a fraction of a percentum of aluminum.

In testimony whereof l have signed this specification.

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